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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 282 Documents
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Analisis mobilitas pembawa muatan pada lucutan plasma korona negatif konfigurasi kawat silinder menggunakan gas nitrogen BN Michael GP; Muhammad Nur
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Carbon mobility analysis has been carried out on plasma corona discharge of negative of cylindrical wire configuration using nitrogen gas. The study was conducted using a 24 cm long stainless steel cylinder and an iron wire stretched to the center in a cylindrical tube with a wire length of 24 cm. Both ends of the cylinder are closed using an insulator material and given the input and output holes of the gas. The nitrogen gas flowrate used is 2 L / min to 6 L / min at intervals of 1 L / min and the applied voltage is from 0 kV until arc discharges occur at 0.3 kV intervals. The characterization of the negative corona discharge plasma reactor was carried out to determine the initial stresses for the emergence of currents as a sign of the operation of the reactor, the final stresses for knowing arc discharges, reactor working areas, and the relation of currents to stress for gradient values. The result of this characterization is obtained by charge load mobility 4.59x10-1 m2/V.s at 2 L / min flowrate, 9.29x10-3 m2/V.s at flowrate 3 L / min, 1.15x10-1 m2/V.s at a flowrate of 4 L / min, 4.13x10-3 m2/V.s at a flowrate of 5 L / min, and 9.29x10-3 m2/V.s at a flowrate of 6 L / min. The result of this negative corona charge discharging mobility is compared with a positive corona discharge study. From this comparison it can be concluded that the mobility of negative corona discharge charge carriers at 2 L / min flow discharge is higher than positive discharge, while at 6 L / min flowrate the negative and positive corona charge discharge charge is equal. Keywords: Plasma corona negative, cylinder wire, charge carrier mobility, nitrogen gas, voltage, current
INTERPRETASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI AREA MANIFESTASI PANAS BUMI KALIULO, GUNUNG UNGARAN Dewi Mariyaningsih; Agus Setyawan
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Geoelectric method is one of the geophysical methods that used in the exploration of natural resources below the surface. The research has finished by using geoelectric method schlumberger configuration in Kaliulo geothermal manifest area. Kaliulo is one of geothermal manifest which exist in geothermal system of Ungaran Mountain. The purpose of researching is to know layer of subsurface structure which control Kaliulo geothermal manifest.Field measurement data in the field are potential differences and currents which can be used to calculate apparent resistivity value. After apparent resistivity value is created then processed using IPI2WIN program to know resistivity value in each layer with geology information validation. Geoelectric resulting indicates normal faults which weak zones where fluid discharge to surface.Keyword: geoelectric, geothermal, Kaliulo, Ungaran Volcano
APLIKASI PENGOLAHAN CITRA PADA RASPBERRY PI UNTUK MEMBEDAKAN BENDA BERDASARKAN WARNA DAN BENTUK Figur Humani; Kusworo Adi; Catur Edi Widodo
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Computer technology has been developed to support problem solving in human life. Nowadays, minicomputer has been the focus of development for its practicality. The role of technology has progressed from word processing programs to digital image processing programs. Digital image processing is one of technology processing using computer vision. The role of digital image processing is a common process in industries and has been use to increase their productivity. One of those utilizations is image processing in beverage industries to detect the number of empty bottles in crates. Digital processing which supports industries has been a factor to increase productivity. The innovation in the research was utilizing minicomputer called raspberry to be integrated with image processing system and motor servo control. The result is a system to distinguish various objects based on their colors and shapes using image processing system on raspberry based on open CV and to control motor servo to classify objects. The accuracy to classify red circular objects was 92,5% , for green circular objects was 97,5% , and red rectangular objects was 97,5% by using camera resolution 480x320.
ANALISIS POSISI DETEKTOR TERHADAP STEM EFFECT DAN DOSIS RELATIF UNTUK DOSIMETRI PESAWAT LINAC 6 MV Nurul Laili Khoirut Tabi’atin; Evi Setiawati; Zaenal Arifin
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research conducted aims to determine the effective position’s detector for Percentage Depth Dose ( PDD ), crossline and inline scanning in dosimetry linac 6 MV with analisys of relative dose and minimal stem effect on the detector. Research carried out by using detector CC TNC / 9770 and detector CC TNC / 9776 with variety on the position of the detector on axes x1, y1, x2 and y2, and  wide field irradiation of 10 x 10 cm2 at SSD 100 cm. On this research for PDD  scanning, position’s detector coincide to relative dose and at any depth. The largest is in position y1 with measurement dose  100.06 %. So position y1 used as reference position for measurement of stem effect. For PDD  scanning ratio stem effect on the position of y2, x2, and x1 are 0.260521 %, 0.049995 % and 0.140112 %. So the effective position’s detector for PDD scanning is position x2 with the ratio of the smallest stem effects is 0.049995 %. For crossline scanning, position x1 used to an form position for measurement of stem effect because have the largest measurement of relative dose that is 100.04 %. For crossline scanning ratio stem effect on the position of y1, x2 and y2 are 0.080032 %, 0.080032 %  dan 0.240481 %. In position y1 and x2 have a same of ratio stem effect, but based on distribution of measurement dose in the beginning and the end scanning, effective position of the detector for crossline scanning in position y1. For inline scanning, position x1 used as reference position for measurement of stem effect because have the largest measurement of relative dose that is 100.00 %. So position y1 used as reference position for measurement of stem effect. For inline scanning ratio stem effect on the position of y2, x2, and x1 are 0.070049 %, 0.020004 %  and 0.010001 %. So the effective position’s detector for inline scanning is in position x1 which has the smallest stem effect is 0.010001 %.Keyword: PDD scanning, crossline scanning, inline scanning, relative dose, stem effect.
INTERPRETASI BAWAH PERMUKAAN GUNUNG MERAPI DENGAN ANALISA GRADIENT DAN PEMODELAN 2D DATA GAYABERAT Wisnu Agung Permadi; Agus Setyawan; Ilham Nurdien
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Gravity method research has been done in Merapi Volcano area. The data has been measured by BPPTKG Yogyakarta team with the number of point as much as 164 points. The aim of this research are to identify the subsurface structure and locate the position of Merapi Volcano magma chamber, so that a gradient analysis and 2D modelling based on Bouguer anomaly has been done. Gradient analysis apply first horizontal and second vertical gradient that is used to know the location and the type of structure on the research area. The result from this research show Bouguer anomaly with range value around -8.79 mGal to 305.46 mGal. The 2D modelling show Merapi volcano subsurface model that consist of 5 layers with the position of magma chamber is located in the third layer about 3300 m below the Merapi summit or 700 m below the mean sea level. Based on gradient analysis, there is a normal dipfault structure. This faults is indicated to be formed a basin on the Merapi summit toward westward leading directly to the Patuk Alap Alap Mountain and Kali Krasak.
APLIKASI METODE MAGNETIK UNTUK MELOKALISASI TARGET ZONA MINERALISASI EMAS DI DAERAH “X” Seftyand S Briyantara; Tony Yulianto
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research aimed to localize the target of the gold mineralized zones are located in “X” area. Based on the evaluation of geological data mineral alteration, lithology, and geology structure, this area is concluded that the mineralization type was High Sulphidation with characteristic alteration found in the form of quartz, phyropilite, allunite, muscovite, smectite and kaolinite.The methods are processing data using Oasis Montaj software which then created the total magnetic intensity map. Of the total magnetic intensity map was filtered to produce 50 meters upward continuation and RTP (reduction to the pole) map. Qualitative interpretation were done by analysis of RTP map to determine the target of gold mineralization according to the characteristic of magnetic anomaly. Quantitative interpretation was done by combined between RTP map with IP data. Besides that, quantitative interpretation was done by 2D modelling by slicing RTP map using Oasis Montaj.The result of study showed two high anomalies can be interpreted as igneous intrusions with susceptibility 1 x 10-2 (SI-unit) and two low anomalies with susceptibility -3.7 x 10-5 (SI-unit) can be interpreted as the mineral quartz. Keywords: gold, minerals alteration, reduce to the pole, high sulphidation, oasis montaj.
Aplikasi gelombang ultrasonik untuk pengukuran tingkat kekasaran permukaan beton Heri Sugito; Diana Layla Riskawati
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The measurement of surface roughness level of matter was done by ultrasonik wave Time-of-Flight methode. The device can be applied to several equirement, such as roughness detection for textile product, sandpaper,asbestos, ceramics, steel and metal industry, etc. The measurement is needed for quality product improvement.  The measurement performed by scanning object which rotated 200 times with stepper motor using ultrasonic transduser. The transduser transmit pulse to object trough transmitter and receiver pulse. The result of scanning displayed in Cathode Ray Osciloscop (CRO) then it used to estimating ToF (Time-of-Flight) by calculating the gap between transmitter pulse and receiver pulse. The objects which measured are tree trunk, concrete A, and concrete B. The reason of selecting the test object is for minimize the atenuation so it can increase the reflection. The result of measurement for average surface roughness of objects are: tree trunk (Ra is minimum 8%, and Ra is maximum 17%), concrete A (Ra is minimum 10%, and Ra is maximum 16%), and concrete B (Ra is minimum 8%, and Ra is maximum 17%).Keywords: surface Roughness, ultrasonic wave, Time-of-Flight
INVERSI AMPLITUDE VERSUS OFFSET UNTUK MENGETAHUI PENYEBARAN HIDROKARBON Di LAPANGAN “X” Muhammad Nur Handoyo; Agus Setyawan; Mualimin Mualimin
Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Inversion of AVO (Amplitude Versus Offset) can be used to identify and maping the spread of hydrocarbons on seismic data. The research was conducted on the field "X" TAF layer Talang Akar’s  formation’s  North West Java basin. AVO inversion performed to obtain angle stack, intercept, gradient and fluid factor attribute. The results of the angle stack analysis indicate AVO anomaly in TAF layer’s. Based on the crossplot between the intercept with the gradient, TAFlayer’s included in Class III AVO anomaly. The results of fluid factor analysis showed TAF layer’s has a negative value, that is estimated to have hydrocarbon potential Key words: Amplitude Versus Offset (AVO),angle stack, intercept, gradient, fluid factor.
STUDI PEMANFAATAN SIFAT PEMBIASAN CAHAYA PADA PORTABLE BRIX METER UNTUK MENGANALISIS HUBUNGAN KONSENTRASI LARUTAN SUKROSA (C12H22O11) TERHADAP pH Iva Nistiyanti; Eko Hidayanto
Youngster Physics Journal Vol 4, No 3 (2015): Youngster Physics Journal Juli 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Sucrose concentration was analyzed using portable brix meter to show the acidity and alkalinity. Materials the brix were sucrose, honey, milk, and vinegar. Sucrose solution was diluted with aquades at concentration of 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, while concentration solution of milk, honey, and vinegar at 5%, 10%, 15% ,20%, 25%, 30%, 35%, 40%, 45%. Solution at each concentration was measured by Portable Brix Meters to determine the concentration of sucrose with work on the principle of light refraction. The acidity or alkalinity of each solution was measured by a pH meter, so we get the graph calculation and the relationship between the concentration of sucrose solution pH to change the acidity or alkalinity of a solution. Increased concentration on pure sugar or sucrose, causing increased levels of alkalinity, while the honey, milk, and vinegar, with increased concentrations cause acidity. Data were analyzed with logarithmic graph approach. The correlation between the concentration of sucrose solution C with a pH in pure sucrose solution  with R2=0.913. The correlation between the concentration of sucrose solution C with a pH in solution of honey, milk, and vinegar.  with R2 = 0.792, dengan R2= 0.956,  with R2= 0.407,  with R2 = 0.974,  with R2= 0.983. The difference of pH value and concentrations are very small. Keywords: sucrose solution, concentration, pH meter, portable Brix meter
Rancang bangun sistem pengaman kebocoran gas LPG (Liquefied Petroleum Gas) menggunakan mikrokontroler Reza Lutfi Ismai; Jatmiko Endro Suseno; Suryono Suryono
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Design of LPG gas leakage safety system using microcontroller has been made in this research. The purpose of this research is to make LPG gas sensor circuit to detect LPG gas concentration and make automation systems for LPG gas leakage protection. LPG gas leakage protection system can be applied for the use of LPG gas safely. Component to detect LPG gas concentration use sensor MQ 5 which can gives resistance as the output value which can be converted into voltage through the voltage devider circuit so that it can be read by microcontroller with ADC feature. The LPG gas concentration and the output voltage on the sensor will be displayed via LCD 16x2. When LPG gas leak occurs the LPG gas concentration detected  by sensor MQ 5 and then microcontroller will do automation such a modified regulator with a servo motor will close the LPG gas flow, buzzer will be active, the LED will be active and the relay will  exhaust LPG gas that came out due to leakage. The automation has different treatments according to the concentration range of detected LPG gas. The range of gas concentration is ppm < 500, 500 < ppm <1000 and ppm >1000. Sensor circuit can detect gas concentration up to 33000 ppm. The test result on LPG gas leak safety automation system showed that the system can work in the event of leakage of LPG gas and effective to reduce LPG gas concentration up to safe zone.Keywords: microcontroller, sensor, LPG gas, gas exhaust, automation system, exhaust system

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